Moriarti AR-15 300 Blackout 10.5" Quad Upper – Nitro-Met, SOCOM Style Brake

10.5" Quad Rail 300 BLK Upper: Specs

Experience unparalleled shooting performance with the Moriarti AR-15 300 AAC Blackout 10.5" Upper Assembly. Designed for reliability and precision, this upper delivers tactical power in a compact form ideal for close-quarters defense, range training, or hunting.

Simply swap your standard AR-15 upper with this drop-in solution to unlock the full potential of the 300 Blackout caliber — no lower changes needed.

Assembly Features:

• Chamber: 300 AAC Blackout

• Barrel Length: 10.5"

• Twist Rate: 1:7 for superior performance with subsonic or heavy projectiles

• Barrel Steel: 4150 Chrome Moly Vanadium, Nitro-Met treated for corrosion resistance and barrel life

• Thread Pitch: 5/8x24 TPI

• Feed Ramps: M4

• Muzzle Device: Gen 2 Micro Reverse Thread Slip-Over Socom Style Fake Suppressor

• Gas System: Pistol-length with .750 Low Profile Steel Gas Block

• Handguard: Midlength Free Float Quad Rail, hardcoat anodized for accessory compatibility and durability

• Upper Receiver: A3 Flat-Top made from certified 7075-T6 aluminum forgings, black hardcoat anodized to military specifications

• Bolt Carrier Group (BCG): Not included

• Charging Handle (CH): Not included

Compatibility:

• Compatible with virtually any Mil-Spec AR-15 lower receiver

• Use with subsonic or supersonic 300 BLK ammunition

• Ideal for pistol builds 

Note: Images may vary. This item does not include sights, BCG, or charging handle.
Made in the USA by Moriarti Armaments

Complete the build with the Moriarti 300 BLK Bolt Carrier Group and Charging Handle

FAQ

Can 300 Blackout ammo be mixed up with 5.56?

Keep them separate. A 300 BLK round can chamber in a 5.56 rifle and firing it can destroy the gun, so mark your 300 BLK magazines and uppers clearly.

Is a bolt carrier group included?

No. Add a standard AR-15/5.56 bolt carrier group; it is available as an add-on on this page.

Is the SOCOM style device a suppressor?

No. It is a slip-over fake suppressor / muzzle device; it does not suppress sound.

Related: 300 Blackout AR-15 uppers · Micro ARP 300 Blackout pistols · 5.56 NATO vs 300 Blackout

Images may not be an exact representation of the product.